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RELATED PARTY INFORMATION - WAKEFERN (Details) - USD ($)
12 Months Ended
Feb. 15, 2014
Jul. 30, 2016
Jul. 25, 2015
Jul. 26, 2014
Related Party Transaction [Line Items]        
Notes receivable from Wakefern   $ 42,735,000 $ 41,421,000  
Wakefern        
Related Party Transaction [Line Items]        
Ownership interest in Wakefern   13.20%    
Purchase obligation, as a percentage of merchandise requirements   85.00%    
Purchase obligation period   10 years    
Percentage of stockholders to request termination   75.00%    
Indebtedness to Wakefern   $ 718,000    
Installment payments year one   341,000    
Installment payments year two   285,000    
Installment payments year three   92,000    
Installment payments after year four   0    
Maximum per store investment   900,000    
Per store investment increase   25,000 25,000  
Additional investment   717,000 738,000  
Vendor allowances and rebates   30,559,000 27,557,000 $ 26,438,000
Support services incurred charges   33,526,000 33,306,000 32,808,000
Demand deposits invested at related party Wakefern   63,609,000 35,428,000  
Interest income earned on investments related entity   $ 2,506,000 $ 2,399,000 $ 2,622,000
Wakefern | Related Party Note Receivable Maturing August 2017        
Related Party Transaction [Line Items]        
Related Party Transaction, Basis Spread on Variable Rate 0.25%      
Percent of notes receivable 50.00%      
Wakefern | Related Party Note Receivable Maturing February 2019        
Related Party Transaction [Line Items]        
Related Party Transaction, Basis Spread on Variable Rate 1.25%      
Percent of notes receivable 50.00%      
Insure-Rite Ltd. | Wakefern        
Related Party Transaction [Line Items]        
Investment in Insure-Rite, Ltd   8.10%